Sr2CuO2Cl2. represents a nearly perfect situation of a 2-D antiferromagnetic CuO2-plane and thus is of certain curiosity while in the context on the origins of superior TC superconductivity. We've measured experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) and also the resonant improvement of valence photoemissionat the https://okada4dsg.com/