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