  The conductance of a ferromagnetic particle depends on the relative
orientation of the magnetization with respect to the direction of current flow.
This phenomenon is known as "anisotropic magnetoresistance". Quantum
interference leads to an additional, random dependence of the conductance on
the magnetization direction. These "anisotropic magnetoresistance fluctuations"
are caused by spin-orbit scattering, which couples the electron motion to the
exchange field in the ferromagnet. We report a calculation of the dependence of
the conductance autocorrelation function on the rotation angle of the
magnetization direction.
