 The electronic structure and local structure distortion of senior underscore 2 IRO underscore 4 were investigated by X-ray absorption spectroscopy, revealing a strong spin orbit interaction and regular IRO underscore 6 octahedra in Ladoct compounds, which accounts for the transition from a mart insulator to a conductive state in senior underscore 2 underscore XLAR underscore XIRO underscore 4 based system. This article was authored by Jie Cheng, Shen Yongsun, Xingli Liu, and others.