Dear users and developers: I'm studying SnSe doped with Cu, first I do the vc-relax for SnSe of unitcell. 
After relaxation, I built a 1*2*2 supercell (32 atoms), then I changed one Sn atom into Cu and do the vc-relax again, My question is should I do the vc-relax again after doping?  The program have been working for 3 days but it seems that it won't be done...  Thank you in advance ! Regards   Yao-Hong Huang -- Graduate student Department of Mechanical Engineering National Cheng Kung University Tainan, Taiwan
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