(a) General 3D geometry of the problem displaying the angle ϑ between the anisotropy axis of the plate and the beam axis z. (b) The wave vectors in-plane deflections (Θ_x) cause the well-known birefringence shift which is comparable to the GH shift, by altering the angle between k and the anisotropy axis. (c) View along the anisotropy axis of the crystal is shown. The transverse Θ_y deflections of the wave vectors rotate the corresponding planes of the wave propagation with respect to the anisotropy axis by the angle ϑ ≈ Θ_y/sin(Θ_y). This causes a new helicity-dependent transverse shift , i.e., a spin-Hall effect similar to the IF shift. Further details are in the text.