  The statistics of the energy eigenvalues at the metal-insulator-transition of
a two-dimensional disordered system with spin-orbit interaction is investigated
numerically. The critical exponent $\nu$ is obtained from the finite-size
scaling of the number $J_0$ which is related to the probability $Q_{n}(s)$ of
having $n$ energy levels within an interval of width $s$. In contrast to
previous estimates, we find $\nu=2.32\pm 0.14$ close to the value of the
two-dimensional quantum Hall system.
