Actually, I only want a pre superscipt, so the following works for me
\def\presuper#1#2%
{\mathop{}% To prevent preceeding mathord atoms to approach
\mathopen{\vphantom{#2}}^{#1}% To prevent space between prescript
% and next atom.
\kern-\scriptspace% remove the space introduced by superscript
#2}
This is not perfect, especially with characters with large left
"slope" like A. Any suggestions for improving the macro?
Aditya
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