  The bulk-sensitive Ce 4$f$ spectral weights of various Ce compounds including
CeFe$_2$, CeNi$_2$, and CeSi$_2$ were obtained with the resonant photoemission
technique at the Ce 3d-edge. We found the lineshapes change significantly with
the small change of the incident photon energy. Detailed analysis showed that
this phenomenon results primarily from the Auger transition between different
multiplet states of the Ce $\underline{3d_{5/2}}4f^2$ (bar denotes a hole)
electronic configuration in the intermediate state of the resonant process.
This tells us that extra care should be taken for the choice of the resonant
photon energy when extracting Ce 4$f$ spectral weights from the Ce 3$d$-edge
resonant photoemission spectra. The absorption energy corresponding to the
lowest multiplet structure of the Ce $\underline{3d_{5/2}}4f^2$ configuration
seems to be the logical choice.
