documentclass[12pt,a4paper,twoside]{report} %openright

%Schriftart Arial - ACHTUNG: Compile with XeLaTeX (not PDFLaTeX)!
usepackage{fontspec}
defaultfontfeatures{Scale = MatchLowercase}
setmainfont{Arial}[Scale = 1.0]

%Seitenlayout
usepackage[top=2.5cm, bottom=2cm, left=2.5cm, right=2.5cm,paper=a4paper]{geometry}

%Zeilenabstand ändern
usepackage[onehalfspacing]{setspace}

%Graphiken und Bilder
usepackage{subfig}

%Kopfzeile
usepackage{fancyhdr}

%Verzeichnisse
usepackage[notindex, nottoc, numbib]{tocbibind}
%usepackage[subfigure]{tocloft}
%renewcommandcftchapdotsep{cftdotsep}

%Längenangaben für den Abstand zwischen zwei Absätzen.
usepackage{parskip}

%Kapitelanzeige und -platzierung im Text
usepackage[clearempty]{titlesec}
titleformat{chapter}{normalfontfontsize{16pt}{0}bfseries}{thechapter.}{9pt}{}
titleformat{section}{normalfontfontsize{14pt}{0}bfseries}{thesection}{9pt}{}
titleformat{subsection}{normalfontfontsize{12pt}{0}bfseries}{thesubsection}{9pt}{}
titlespacing*{chapter}{0pt}{-22pt}{7pt}


% = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
% Formatierung der Kopfzeile
% = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
setlength{headheight}{0.6cm}

pagestyle{fancy}
fancyhf{}
fancyhead[EL,OR]{fontsize{8}{10} selectfont thepage}
fancyhead[ER,OL]{fontsize{8}{10} selectfont leftmark}
renewcommand{chaptermark}[1]{markboth{#1}{}}

fancypagestyle{plain}{
fancyhf{}
fancyhead[EL,OR]{fontsize{8}{10} selectfont thepage}
fancyhead[ER,OL]{fontsize{8}{10} selectfont nouppercase leftmark}
}


% = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
% Anfang von Dokumententext
% = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
begin{document}

pagenumbering{Roman}

% = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
% Verzeichnisse
% = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
tableofcontents


chapter{Chapter 1}
section{test section}
subsection{test section}
section{test section}
subsection{test section}

end{document}

usepackage[subfigure]{tocloft}
renewcommandcftchapdotsep{cftdotsep}

titlespacing*{chapter}{0pt}{-22pt}{7pt}