%define header in a nice way using fancy header get info here
%http://www.ctan.org/tex-archive/macros/latex/contrib/fancyhdr/fancyhdr.pdf

\usepackage{fancyhdr}
\pagestyle{fancy}
\setlength{\headheight}{16pt} 

%\renewcommand{\chaptermark}[1]{% 
%\markboth{\thechapter.\ #1}{}} 
%\renewcommand{\sectionmark}[1]{\markright{\thesection\ #1}}
%\pagestyle{empty}


%define style for all \pagestyle(fancy} pages
\fancyhead{}
\fancyhead[L]{}
\fancyhead[R]{\nouppercase{\rightmark}}
%\fancyhead[L]{\bfseries \rightmark}
\fancyfoot{} % clear all footer fields
\fancyfoot[C]{\thepage}

%\fancyfoot[LE,RO]{\thepage}
%\fancyfoot[LO,CE]{}
%\fancyfoot[CO,RE]{}

\renewcommand{\headrulewidth}{0.1pt}
\renewcommand{\footrulewidth}{0.1pt}


%chapter sites default to plain page style
%so we overwrite plain with the desired style
\fancypagestyle{plain}{%
\fancyhf{} % clear all header and footer fields
\fancyfoot[c]{\thepage}
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0.1pt}}