  We investigate the planar Hall effect (PHE) in two-dimensional (2D)
superconductors with spin-orbit interactions, where transport anisotropy is
induced by an in-plane magnetic field. While PHE typically arises from the
breaking of basal mirror symmetry, when the field exclusively couples to spin
degrees of freedom, it remains negligible in non-interacting systems. In this
study, we explore anisotropic paraconductivity as an alternative mechanism for
PHE observed in 2D superconductors in the normal state. Due to the momentum
dependence of spin-orbit interactions, the field-induced pair breaking exhibits
anisotropy. To elucidate this phenomenon, we compute the PHE for the Rashba
spin-orbit interaction. Our analysis reveals that Cooper pairs propagating
along the field experience stronger pair breaking compared to those moving
perpendicular to the field. This physical insight is corroborated by explicit
calculations of paraconductivity.
