Sorry for the late reply.
> I tried it simply with the 'canonical' troff font (Times Roman).
> Iin this font the accent generated by overstriking seems off-center
> to the left in virtually all combinations (most of them of course
> not useful), see attachment. Maybe the metrics of \[ah] are not
> quite right after all? Especially accents over the frequently
> occuring 'c' and 's' would profit from a slight shift to the right.
The metrics for `ah' are OK -- this is a spacing glyph. If you look
into old AFM files (which still have the `CC' command to build
composite glyphs) you can see that the caron is positioned
individually for each composite. Examples:
CC Scaron 2 ; PCC S 0 0 ; PCC caron 112 212 ;
CC zcaron 2 ; PCC z 0 0 ; PCC caron 56 0 ;
Werner
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