Hi John,
SZ and DZ results would not be very compatible, since due to different
basis size (and BSSE) you'd get different lattice constants.
However the rest of the physics should be reproduced at least
qualitatively correct.
So, I'd suggest, that if this is a really big slab, you can go with SZP
(P is very important, for some materials SZP is better than DZ. In any
case SZP is much faster), and then scale the coordinates to get the same
lattice as in DZP and then continue relaxation in DZP.
Alex.
