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A neutron supermirror is a highly polished, layered material used to reflect neutron beams. Supermirrors are a special case of multi-layer neutron reflectors with varying layer thicknesses.[1]

Supermirrors are produced by depositing and polishing large numbers of layers of a reflecting substance, such as silicon, nickel, titanium or nickel/titanium composite, on a substrate. In this way, the critical angle of total reflection becomes $$n\cdot\theta_c$$ , where n is the number of layers and $$\theta_c$$ the angle of total reflection for a single layer.
References

Chupp, T. "Neutron Optics and Polarization" (PDF). Retrieved 16 April 2019.

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