  The effect of a tilted dc magnetic field on the transport properties of a two
dimensional electron gas (2DEG) is studied. The influence of the component of
magnetic field parallel to the surface is analyzed and the dependence of the
Fermi energy on the intensity and direction of the external field is discussed.
Numerical results are obtained for the Hall conductivity considering values of
electronic densities and strength of the dc magnetic field that are currently
obtained in many laboratories
