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Xe 4d photoionization in Xe@C<sub>60</sub>, Xe@C<sub>240</sub>, and Xe@C<sub>60</sub>@C<sub>240</sub>
Re-evaluated parameters for the square-well potential model for photoionization of endo-fullerenes are proposed and employed to reveal the spectacular modifications in the Xe 4d photoionization giant resonance along the path from Xe@C60 to Xe@C240 to multi-walled Xe@C60@C240.