GaAs large polyxtal wafers (cmp issue?)

Hi guys,
(read below for the real question..) My thanks to everyone who sent me e-mail replies to my posting about GaAs bicrystals. If what is meant by bi-crystal is a twinned boundary,
I did find some sources, most noteably was AXT materials (Bob Tobin), who was helpful in scanning through his stock for oddities.
In talking with my professor, however, I've been pointed to the fact that for us, a twin is going to be very uninteresting, and we'll merely grow a twin boundary in our material. Right now we are trying to grow large grains (best if there were only 1 grain boundary in the crystal, but I don't know how it'd stay together if that were the case ;)
In anycase, I'm looking for very large-grain polycrystal GaAs wafers. NOW, to the real question::
->-> Can one obtain a polished (say near epi-ready) polycrystalline wafer? There's been a discusson about the difficulties in chemical-mechanical polishing of poly wafers... aparently it won't work. Can anyone shed any light on this for me?
I greatly appreciate any thoughts/suggestions/help. [I'd love to see the results of the cmp on poly... is there a web-site you can suggest? it doesn't need to be gaas... can just be si.
Thanks again for your help!
When I've gotten to the bottom of my supply issues, I'll get back on and tell everyone the results.
Don't forget I'll be out of newsgroup land on the 27th until I can figure out a nice way to get back on... [google if I have to]... so, e-mail is appreciated. Just unmangle the address below...
Again, thanks for your help, -Allen ahall@deletmeifyouwanttoemailme-

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