Hello, Dear members of community

Recently, i started to study Dmol3 program and also tried to calculate graphene system.

In Dmo3 package, except for graphene, the structure of other carbon-based materials are well defined and easily built

I tried to make periodic graphene structure from CNT but i can't control the angles and torsion angles.

For doing my calculations, i really need to prepare periodic graphene structure. Thus, i need you guys help.

Could you someone tell me how can i make periodic graphene sheet  in Dmol3 package

or give me unit structure of graphene ??

Best wishes