It can be said that the axial direction has higher covalency than the in-plane direction. Since the signal of the powder sample is an average of all orientations, the Pt direction has the highest covalency in 2. Therefore, it was possible to experimentally clarify the anisotropy of the Ln complex's covalency in which it may be overall means ligand field splitting considering covalency and electron repulsion, using the single-crystal polarized X-ray absorption spectrum. In this work, only the two-dimensional orientation is considered, and the LnPt molecule orientation (Pt-Ln-Pt direction) is also slightly leaning from c axis. Therefore, the comparison with the isotropic powder sample is not simple. However, further research will enable us to visualize the three-dimensional anisotropy of covalency. In the following sections, we examined the results of XANES or properties of Gd-Pt bond by clarifying donor-acceptor interaction, evaluation of bonds and electronic states.