Article: bad footer on the second page

Question

See the previous question. This is how my letter looks like

\documentclass[a4paper, 11pt]{article}

\usepackage{fontspec}
\usepackage{fancyhdr}


\newcommand{\DocumentTitle}{Motivation Letter}
\newcommand{\Author}{John Smith}

\setmainfont{Times New Roman}
\newfontfamily\hdrfont[ LetterSpace=5.0, WordSpace=1.0, Scale=0.9, Color=FFFFFF ]{Arial}

\usepackage[hmargin=1in,vmargin=0.4in, includehead, includefoot]{geometry}
\setlength{\parindent}{0in}
\linespread{1.2}
\parskip 11pt

\pagestyle{fancy}
\fancyhf{} % clear all header and footers
\setlength{\headheight}{0.0in}
\fancyhead[L]{\hdrfont\textbf{\DocumentTitle} \\ \emph{\Author}}
\fancyhead[R]{\hdrfont\thepage}
\fancyfoot[L]{\hdrfont\textbf{\DocumentTitle} \\ \emph{\Author}}
\fancyfoot[R]{\hdrfont\thepage}

\renewcommand{\headrulewidth}{0.4pt}
\renewcommand{\footrulewidth}{0.4pt}

\renewcommand{\today}{ February 16, 2009 }
\begin{document}

{ \vspace*{0.5in} }
\hspace{4.8in}\today
\vspace{0.2in}

\hspace{0.5in}To Whom It May Concern,
\vspace{0.2in}

My Letter

\vspace{0.2in}
\hspace{0.5in}Respectfully,

\vspace{0.1in}
\hspace{0.5in}\Author

\end{document}

What like the pdf looks like

--------------------------------------- PAGE BEGIN
                                        H
--------------------------------------- HEADER RULE
                                        M1
To Whom It May Concern,---------------- TEXT BEGIN
My Letter
Respectfully,-------------------------- closing
                                        S
John Smith----------------------------- signature
--------------------------------------- TEXT END
                                        M2
--------------------------------------- FOOTER RULE
                                        F
--------------------------------------- PAGE END

On the first page it looks ok and H=F. Starting from the second page F is surprisingly small. Do you have any ideas?

This is the resulting PDF (with some text):

Answer 1

If you set the head height to a value that fancyhdr thinks wrong (and it is wrong, by the way), it seizes the initiative and corrects it from the second page on, thus destroying your setting.

Actually with your setting, H and F are different: you get 0.4 in from the upper page margin to the top of "Motivation Letter" and from the page lower margin to the baseline of "Motivation Letter", not of "John Smith" at the bottom.

If you want a more precise spacing, just do

\usepackage[hmargin=1in,top=0.4in, bottom=\dimexpr0.4in+1.2\baselineskip\relax,
  includehead, includefoot,headheight=25pt]{geometry}

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