Writing a book of probability in arabic, and using the titleps package for the headpage, I obtain some non-beautiful result when there is in the headings some "long-down" letters like the arabic letter ع , for example, where the rule touch some letters. So I want to push down the rule of heading with 1pt or 2, to obtain a best heading. How I can I do this?
I give an example to watch you the effect..

I use titleps and this is my page style..
\newpagestyle{Mybookstyle}{
\setheadrule{.1pt}% Header rule
\sethead
[\thepage\hspace*{14pt}\thetitle]% even left
[]% even centre
[\sectiontitle \hspace*{5pt} .\thesection]% even right
{الباب
\arabic{chapter}.
\chaptertitle}% odd left
{}% odd centre
{\thepage}% odd right
}


fancyhdr? – Ryan Dec 03 '14 at 06:56fancyhdrinstead oftitlepsthis may help. http://tex.stackexchange.com/q/85178/24974 – erik Dec 03 '14 at 06:58fancyhdr, it's pretty powerful for more complex headers and in my experience it's easier to work with. – Ryan Dec 03 '14 at 07:07geometry, there is the optionheadheight=<length>, which might do the trick (e.g.,\usepackage[headheight=14pt, <other options>]{geometry}). Some classes, such asmemoiror theKOMAclasses have their own built-in facilities for such things. – jon Dec 03 '14 at 07:07