<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div dir="ltr" data-setdir="false">Hello All,</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I started using QE this month and I'm interested in calculating the binding energy of graphene/cu(111) interface using just 1x1 unit cell of both.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I used vesta to create the cu(111) slab and also join the graphene with the cu(111) slab. I have an input file but I'm not certain if I got all the inputs correctly. Also, do I execute a 'vc-relax' or 'relax' calculation?</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Your advice would be highly appreciated.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Thanks,<br></div></div></body></html>