  Nb-doped SrTiO$_{3}$ epitaxial thin films have been prepared on (001)
SrTiO$_{3}$ substrates using pulsed laser deposition. A high substrate
temperature ($>1000^{\circ}{C}$) was found to be necessary to achieve
2-dimensional growth. Atomic force microscopy reveals atomically flat surfaces
with 3.9 \AA $ $ steps. The films show a metallic behavior, residual
resistivity ratios between 10 and 100, and low residual resistivity of the
order of 10$^{-4}$$\Omega$cm. At 0.3 K, a sharp superconducting transition,
reaching zero resistance, is observed.
