Sr2CuO2Cl2. signifies a nearly ideal scenario of the two-D antiferromagnetic CuO2-aircraft and therefore is of distinct fascination from the context from the origins of significant TC superconductivity. Now we have measured experimentally and analyzed theoretically the Ti 2p X-ray photoemission spectra (XPS) and the resonant improvement of valence photoemissionat the https://okada4dsg.com/