  We study S-matrix correlations for random matrix ensembles with a Hamiltonian
which is the sum of a given deterministic part and of a random matrix with a
Gaussian probability distribution. Using Efetov's supersymmetry formalism, we
show that, in the limit of infinite matrix size of the Hamiltonian, correlation
functions of S-matrix elements are universal on the scale of the local mean
level spacing: the dependence of the deterministic part enters into these
correlation functions only through the average S-matrix and the average level
density. This statement applies to each of the three symmetry classes
(orthogonal, unitary, and symplectic).
