  In the asymptotic limit, the interlayer exchange coupling decays as $D^{-2}$,
where $D$ is the spacer thickness. A systematic procedure for calculating the
preasymptotic corrections, i.e., the terms of order $D^{-n}$ with $n \ge 3$, is
presented. The temperature dependence of the preasymptotic corrections is
calculated. The results are used to discuss the preasymptotic corrections for
the Co/Cu/Co(001) system.
