Sr2CuO2Cl2. Signifies a virtually ideal scenario of the 2-D antiferromagnetic CuO2-plane and thus is of individual interest from the context from the origins of higher TC superconductivity. We've got calculated experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) and the resonant enhancement of valence photoemissionat the Ti https://okada4dsg.com/