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We have measured Ce 4f spectral weights of extremely $\alpha$-likeCe-transition metal intermetallic compounds CeRh$_x$ (x=2,3) and CeNi$_x$(x=2,5) by using the {\it bulk-sensitive} resonant photoemission technique atthe Ce $M_5$($3d_{5/2}\to4f$)-edge. Unprecedentedly high energy resolution andlonger escape depth of photoemitted electron at this photon energy enabled usto distinguish the sharp Kondo resonance tails at the Fermi level, which can bewell described by the Gunnarsson-Sch\"onhammer(GS) calculation based on theAnderson Impurity Hamiltonian. On the other hand, the itinerant 4f banddescription shows big discrepancies, which implies that Ce 4f electrons retainlocalized characters even in extremely $\alpha$-like compounds.Comment: 4 pages, 3 figures, submitted to Phys. Rev. Let

physical review letters

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Localized Character of4fElectrons inCeRhx