Lowering the arrow in overset{rightharpoonup}{calR}

Question

I have the following:
overset{rightharpoonup}{calR}

which produces

What I would like to do is to lower the rightharpoonup so that it is closer to the calR and doesn't cause a larger gap between lines. How can I do this?

egreg · Accepted Answer

The main problem is the bounding box of rightharpoonup.
Some low level programming will help.
documentclass{article}
usepackage{amsmath}

makeatletter
DeclareRobustCommand{hvec}[1]{{mathpalettehvec@{#1}}}
newcommand{hvec@}[2]{%
  vbox{offinterlineskip
    ialign{%
      hfil##hfilcr
      $m@th#1{}_{rightharpoonup}$kern-scriptspacecr
      $m@th#1#2$cr
    }%
  }%
}
makeatother

begin{document}

$hvec{mathcal{R}}_{hvec{x}}$
% compare with
$overset{rightharpoonup}{mathcal{R}}_{overset{rightharpoonup}{x}}$

end{document}

Lowering the arrow in overset{rightharpoonup}{calR}

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