  The Raman coupling coefficients of site- and bond-percolators at
concentration higher than percolation threshold are computed for two scattering
mechanisms: Bond Polarizability (BPOL) and Dipole-Induced-Dipole (DID). The
results show that DID does not follow a scaling law at low frequency, while in
the case of BPOL the situation is less clear. The numerically computed
frequency dependence in the case of BPOL, which can be considered a good
scattering mechanism for a wide class of real glasses, is in semiquantitative
agreement with experimental results.
