  he Casimir force is calculated between plates with thin metallic coating.
Thin films are described with spatially dispersive (nonlocal) dielectric
functions. For thin films the nonlocal effects are more relevant than for
half-spaces. However, it is shown that even for film thickness smaller than the
mean free path for electrons, the difference between local and nonlocal
calculations of the Casimir force is of the order of a few tenths of a percent.
Thus the local description of thin metallic films is adequate within the
current experimental precision and range of separations.
