How can I make KOMA-Script package scrlayer-scrpage add a header to every page, even the pages where a new chapter starts?
I got this MWE:
\documentclass[a4paper, 12pt, ngerman, oneside]{scrreprt}
\usepackage[headsepline,automark]{scrlayer-scrpage}
\pagestyle{scrheadings}
\begin{document}
\chapter{Chapter}
\section{Section}
\newpage
\section{2nd Section}
\end{document}
Which adds a header to every page except the pages where a chapter begins.
The first page of an chapter is formated with style plain.scrheadings so you need to define it.
One possibility is to use something like \chead*{\leftmark}. The asterix marks that also style plain.scrheadings has to be changed too.
Please see the following MWE
\documentclass[a4paper, 12pt, ngerman, oneside]{scrreprt}
\usepackage[%
headsepline,
plainheadsepline, % <=================================================
automark
]{scrlayer-scrpage}
\clearpairofpagestyles % <==============================================
\chead*{\leftmark} % <==================================================
\ihead*{\pagemark} % <==================================================
\pagestyle{scrheadings}
\begin{document}
\chapter{Chapter}
\section{Section}
\newpage
\section{2nd Section}
\end{document}
and its result:
