[SIESTA-L] defect in graphene

[roz _gh]

dear siesta users
i work with siesta 2.0.2. i want to investigate Stone-Wales defect on graphene, 
but
1. I dont know how do atomic coordinates change?
2.can I consider a big unit-cell instead of a super cell? I want to create 
unit-cell that involves about 40 atoms, are the 40 atoms suitable?
please help me, thanks...