Dear Nicola Thanks so much .
According to this graph and your words I use smearing 0.001 Ry with kpoint 2*2*1 is enough to get a good result. or I must be increase smearing ? I have other problem with smearing and magnetic properties This smearing and kpoint is good for pure surface but when I add molecule in surface use this smearing is not good for magnetic properties I run ferromagnetic state but I see the tot=0 and absolute=0.85 (anti ferromagnetic state) It is True? Best Regards Elham
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