  The anisotropic conductivity of thin Nd$_{1.85}$Ce$_{0.15}$CuO$_{4-\delta}$
films was measured in the frequency range 8 cm$^{-1}<\nu <$ 40 cm$^{-1}$ and
for temperatures 4 K $<T<300$ K. A tilted sample geometry allowed to extract
both, in-plane and c-axis properties. The in-plane quasiparticle scattering
rate remains unchanged as the sample becomes superconducting. The temperature
dependence of the in-plane conductivity is reasonably well described using the
Born limit for a d-wave superconductor. Below $T_{{\rm C}%}$ the c-axis
dielectric constant $\epsilon_{1c}$ changes sign at the screened c-axis plasma
frequency. The temperature dependence of the c-axis conductivity closely
follows the linear in T behavior within the plane.
