Sr2CuO2Cl2. represents an almost perfect situation of a 2-D antiferromagnetic CuO2-plane and thus is of particular fascination inside the context from the origins of superior TC superconductivity. We have now measured experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) as well as the resonant enhancement of valence https://okada4dsg.com/