Polarized Cu L3 absorption experiments have been made on T12Ba2CaCu~08yq well-oriented thin films by x-ray spectroscopy. Using a fitting procedure, the doping hole density per copper atom has been measured to be 16%. The results are in agreement with a doping occurring only with the (x,y) symmetry in the [Cu02]"planes of these layered structures. Unpolarized XAS experiments have also been conducted on Tl(2:2:0:1),Tl(2:2:1:2),Tl(2:2:2:3),and Tl(1:2:2:3)ceramics with different doping and superconducting properties. The results show that, in the copper monolayer compound, the change in the doping hole density is accompanied by a drastic change of T, while this effect appears less important in the copper bilayer compounds and even uneffective in the three-layer one. These results show that the doping hole density is a key factor to monitor the superconducting properties and that the number of copper layers also plays an important role.
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