Sr2CuO2Cl2. represents a nearly perfect situation of the two-D antiferromagnetic CuO2-aircraft and so is of particular fascination within the context from the origins of high TC superconductivity. We've measured experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) and the resonant improvement of valence photoemissionat the Ti 2p https://okada4dsg.com/