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In a recent Letter, Luo et al. (Phys. Rev. Lett. 92, 256602 (2004)) analyzethe Fano line shapes obtained from scanning tunneling spectroscopy (STS) oftransition metal impurities on a simple metal surface, in particular of theTi/Au(111) and Ti/Ag(100) systems. As the key point of their analysis, theyclaim that there is not only a Fano interference effect between the impurityd-orbital and the conduction electron continuum, as derived in Ujsaghy et al.(Phys. Rev. Lett. 85, 2557 (2000)), but that the Kondo resonance in thed-electron spectral density has by itself a second Fano line shape, leading tothe experimentally observed spectra. In the present note we point out that thisanalysis is conceptually incorrect. Therefore, the quantitative agreement ofthe fitted theoretical spectra with the experimental results is meaningless.Comment: 1 page, no figures. Accepted for publication in PRL; revised version  uploaded on November 18th, 200

Comment on “Fano Resonance for Anderson Impurity Systems”