Fresnel plot

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X-ray and neutron reflectivity curves are often displayed as Fresnel plots, which means plotting \scriptstyle R(q_z) \times q_z^4 vs. \scriptstyle q_z (instead of simply \scriptstyle R(q_z) vs. \scriptstyle q_z). This representation divides-out the generic functional form of the Fresnel reflectivity from a single idealized interface (which goes as \scriptstyle R_F \sim q_z^{-4}). This is useful for highlighting the features/oscillations of the reflectivity curve, by suppressing the expected decay of the curve with angle.