Itinerant to Localized Heavy Electron Magnetism in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi>Ce</mml:mi> <mml:mo stretchy="false">(</mml:mo> <mml:msub> <mml:mrow> <mml:mi>Ru</mml:mi> </mml:mrow> <mm

Electronic and crystal structures of Ce(Ru_{1-x}Rh_{x})_{2}Al_{10} have been studied using x-ray emission spectroscopy, photoelectron spectroscopy (PES), and x-ray diffraction. No structural phase transition was observed up to x=0.1, while the x-ray absorption spectra showed a Ce valence transition between x=0.03 and 0.05, accompanied by an increase in c-f hybridization strength, suggesting a Lifshitz transition. Angle-resolved PES conducted on the x=0.1 sample revealed stronger hybridization along the b axis compared to the other axes. Direction-dependent hybridization introduces complexity in applying conventional phase diagrams. For the first time, we propose a direction-dependent phase diagram for Ce(Ru_{1-x}Rh_{x})_{2}Al_{10}, advancing beyond the traditional Doniach phase diagram.