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Motivated by very recent studies of Coulomb drag in grahene-BN-graphenesystem we develop a theory of Coulomb drag for the Fermi liquid regime, for thecase when the ratio of spacer thickness $d$ to the Fermi wavelength ofelectrons is arbitrary. The concentration ($n$) and thickness dependence of thedrag resistivity is changed from $n^{-3}d^{-4}$ for the thick spacer to$n^{-1}|\ln{(nd^2)}|$ for the thin one.

Coulomb drag in graphene single layers separated by a thin spacer