  We show that the enhancement of backscattering responsible for the weak
localization is accompanied by reduction of the scattering in other directions.
A simple quasiclassical interpretation of this phenomenon is presented in terms
of a small change in the effective differential cross-section for a single
impurity. The reduction of the scattering at the arbitrary angles leads to the
decrease of the quantum correction to the conductivity. Within the diffusion
approximation this decrease is small, but it should be taken into account in
the case of a relatively strong magnetic field when the diffusion approximation
is not valid.
