Dear David,
In principle, starting from a 2D material and applying vc_relax should end up with the 3D version of the material. That is in the graphene case you should end up with graphite upon complete convergence. I doubt that this simulation is your intention here. If you would like , instead, to study biaxial strain effect on doped graphene, then simple manual changes of the a and b of the supercell and relax calculation should do the job. Best Regards, Mostafa MIT
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