  Nd$_{2-x}$Ce$_x$CuO$_{4\pm\delta}$ (NCCO) epitaxial thin films have been
deposited on (100) SrTiO$_3$ substrates by DC sputtering technique in different
atmosphere. The as-grown samples show different dependence of the in-plane
resistivity at low temperature, when they are grown in pure argon atmosphere or
in oxygen. Moreover, an unusual behaviour is also found when transport takes
place in the presence of an external magnetic field. It is commonly accepted
that the higher anisotropic properties of NCCO crystalline cell with respect to
the hole doped YBCO and LSCO and the electric conduction mainly confined in the
CuO$_2$ plane, strongly support the two-dimensional (2D) character of the
current transport in this system. Results on the temperature dependence of the
resistance, as well as on the magnetoresistance and the Hall coefficient,
obtained on epitaxial NCCO thin films in the over-doped region ($x\ge0.15$) of
the phase diagram are presented and discussed.
