The multifractal properties of electronic eigenstates at the metal-insulator
transition of a two-dimensional disordered tight-binding model with spin-orbit
interaction are investigated numerically. The correlation dimensions of the
spectral measure D2 and of the fractal eigenstate D2 are
calculated and shown to be related by D2=2D2. The exponent
η=0.35±0.05 describing the energy correlations of the critical
eigenstates is found to satisfy the relation η=2−D2.Comment: 6 pages RevTeX; 3 uuencoded, gzipped ps-figures to appear in J. Phys.
Condensed Matte