Sr2CuO2Cl2. signifies a virtually ideal scenario of a 2-D antiferromagnetic CuO2-plane and thus is of particular interest within the context from the origins of large TC superconductivity. We now have measured experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) plus the resonant enhancement of valence photoemissionat the https://okada4dsg.com/