  It is shown that the negative magnetoresistance of nanoheterostructures
described by the Fivaz model can become apparent not only under strong, but
also under intermediate or weak degeneracy of free carrier gas in them. In so
doing, in the Fivaz model it becomes apparent to a larger extent than in the
case of a parabolic, though anisotropic, conduction band. The negative
magnetoresistance can be both due to spin splitting and the Landau quantization
proper.
