Atomic Rayleigh scattering of phonons in the vicinity of K-absorption edges

New measurements of coherent (Rayleigh) scattering of photons of energies in the vicinity of K-absorption edges of gold and lead atoms together with other recent measurements with a coverage in the momentum transfer region up to 1.0 mc are presented for a critical evaluation of (i) the latest relativistic calculation of coherent scattering factors, (ii) the anomalous dispersion correction to the scattering factors and (iii) the exact numerical Rayleigh scattering amplitudes of inner electron shells. This evaluation reveals the ranges of applicability of these calculations and indicates the trend of behaviour due to the proximity of K-absorption edges of scatter atoms.