  The indirect RKKY interaction in a layered metal with nearly nested (almost
squared) Fermi surface is evaluated analytically. The final expressions are
obtained in closed form as a combination of Bessel functions. We show that the
expected ``2k_F'' oscillations occur as the far asymptote of our expressions,
where a value of the effective Fermi momentum k_F depends on the direction in
r-space. We demonstrate the existence of the intermediate asymptote of the
interaction which is of the sign-reversal antiferromagnetic type. This part of
RKKY interaction is the only term surviving in the limit of exact nesting. A
good accordance of our analytical formulas with numerical findings is found
until the interatomic distances.
