  We consider the single particle relaxation rate of 2D electrons subject to a
random magnetic field. The density of states (DOS) oscillations in a uniform
magnetic field (in addition to a random one) are studied. We define a gauge
invariant single particle relaxation time as a parameter describing the
amplitude of DOS oscillations. Unlike the conventional case of random potential
scattering the broadening of the Landau levels does not depend on magnetic
field.
