In this paper, we propose an extension to an existing permittivity inversion scheme by taking into account double bounce scattering from a rotated dihedral geometry. By considering the rotational aspect, we aim to broaden the applicability of the permittivity inversion scheme for rotated double bounce signatures present in Synthetic Aperture Radar (SAR) imagery. The validity is first demonstrated by invoking to the characteristics of the co-pol ratio through simulations. The inversion scheme is then tested on real airborne SAR data to further validate its effectiveness in real-world scenarios.