How to write a postscript after appendix in LaTeX?

Question

I writing for my PhD thesis where for one particular chapter, I need to include a postscript after the appendices. I use \usepackage{appendix} in my LaTeX preamble. This is what I want to do:

\newpage
\appendix

\counterwithin{table}{section}
\centering \section{Appendix Tables} \label{sec:appendix} 
....
....

\section{Postscript}
This is my postscript

There are two problems that I am facing. Firstly, the whole text is getting centred and the section header is read as B Postscript whereas I just it to be simply Postscript.

Answer 1

A suggestion for the \centering and the unnumbered section Postscript 'problem':

Either use \begingroup\centering\section{...}\endgroup or \section{\protect\centering Foo} for the centered section title and \section*{Postscript} for the unnumbered section title.

If the package appendix is used (as indicated by the O.P.), it is more comfortable to apply \begin{appendices}...\end{appendices} instead of `\appendix.

If the book or another class with \chapter is used, chapters should be used in appendix, not sections.

In my opinion, I would not center the section title, however.

\documentclass{book}


\usepackage{appendix}
\usepackage{chngcntr}
\usepackage{blindtext}

\begin{document}
\tableofcontents
\blinddocument

\clearpage
\begin{appendices}

\counterwithin{table}{section}
\counterwithout{section}{chapter}
\section{\protect\centering Appendix Tables} \label{sec:appendix} 
....
....


\section*{Postscript}
This is my postscript


\end{appendices}
\end{document}