Circles at the same height

Question

How do I get the two circles to be on the same height? I tried the following

\newcommand{\sss}{\;\;\;\;\;\;\:}
\overset{\circ}{R}_{\mu\nu\sigma\lambda}\overset{\circ\sss}{R^{\mu\nu\sigma\lambda}} 
\overset{\circ}{R}_{\mu\nu\sigma\lambda}\overset{\circ}{R}^{\mu\nu\sigma\lambda}

Any suggestions?

Answer 1

There is a command \mathring in LaTeX, try

\documentclass{article}
\begin{document} 
\begin{displaymath}
\mathring{R}_{\mu\nu\sigma\lambda} \mathring{R}^{\mu\nu\sigma\lambda}
\end{displaymath}
\end{document}

Answer 2

Set the superscript outside the regular setting:

\documentclass{article}

\usepackage{amsmath}
\newcommand{\sss}{\;\;\;\;\;\;\:}

\begin{document} 

\[
  \overset{\circ}{R}_{\mu\nu\sigma\lambda}\overset{\circ\sss}{R^{\mu\nu\sigma\lambda}} \qquad
  \overset{\circ}{R}_{\mu\nu\sigma\lambda}\overset{\circ}{R}^{\mu\nu\sigma\lambda} \qquad
  \overset{\circ}{R}_{\mu\nu\sigma\lambda}\overset{\circ}{R}{}^{\mu\nu\sigma\lambda}
\]

\end{document}