  Theory of the reentrant effect in susceptibility of mesoscopic cylindrical NS
samples is proposed, which is essentially based on the properties of the
Andreev levels. The specific feature of the quantum levels of the structure is
that in a varying magnetic field (or temperature) each level periodically comes
into coincidence with the chemical potential of the metal. As a result, the
state of the system becomes strongly degenerate and the amplitude of the
paramagnetic contribution to the susceptibility increases sharply.
