Sr2CuO2Cl2. Signifies a virtually suitable case of the 2-D antiferromagnetic CuO2-airplane and so is of certain curiosity during the context in the origins of higher 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/