  We calculate analytically the distributions of "level curvatures" (LC) (the
second derivatives of eigenvalues with respect to a magnetic flux) for a
particle moving in a white-noise random potential.
  We find that the Zakrzewski-Delande conjecture is still valid even if the
lowest weak localization corrections are taken into account. The ratio of mean
level curvature modulus to mean dissipative conductance is proved to be
universal and equal to $2\pi$ in agreement with available numerical data.
