  The anisotropic London equations taking into account the normal currents are
derived and applied to the problem of the surface impedance in the Meisner
state of anisotropic materials. It is shown that the complex susceptibility of
anisotropic slab depends on the orientation of the applied microwave field
relative to the crystal axes. In particular, the anisotropic sample in the
microwave field is subject to a torque, unless the field is directed along with
one of the crystal principle axes.
