  We discuss the magnetic response of gold-niobium proximity cylinders in the
temperature range 100 \mu K<T<9 K. The temperature dependence of the
susceptibility in the diamagnetic regime is described well by the
quasiclassical Eilenberger theory including an elastic mean-free path l. In the
mesoscopic regime, the temperature dependence of the reentrant paramagnetic
susceptibility \chi_para(T) \propto \exp[-L/3\xi^d_N(T)] is governed by the
dirty limit coherence length \xi^d_N(T)=\sqrt{1/3\xi_N l_N}, with \xi_N the
clean limit coherence length obtained from breakdown field measurements and l_N
the measured mean-free path in the gold layer. At T=100 \mu K, \chi_para
compensates about 1/5 of the induced diamagnetic susceptibility in gold.
