Sr2CuO2Cl2. Signifies an almost excellent scenario of a 2-D antiferromagnetic CuO2-plane and thus is of particular desire while in the context with the origins of substantial TC superconductivity. We have measured experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) and the resonant enhancement of valence photoemissionat the https://okada4dsg.com/