The correlation energy per atom of a graphite layer is determined by means of increments obtained in ab initio calculations for aromatic molecules with various numbers of correlated localized σ and π orbitals. The resulting correlation contribution to the cohesive energy, evaluated with a double-zeta plus polarization basis set is 0.050 a.u. per C atom, which is smaller by 0.007 a.u. than the corresponding value for diamond.
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Hermann Stoll (1992) studied this question.
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