Grazing-incidence transmission X-ray scattering: surface scattering in the Born approximation

Figure 5
The displacement of the scattering vector due to the refraction effects ( $[\Delta q_z = q_z - q_z']$ ) versus

with different incident angles [0.16° (blue) and 0.76° (green)] and different critical angles of the top slab [0.093° (solid) and 0.114° (dashed)].