Xe 4d photoionization in Xe@C60, Xe@C240, and Xe@C60@C240
  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. 
V. K. Dolmatov and D. A. Keating
physics.atom-ph