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I am trying to understand the reflectivity plot on slide 26 of Neutron optics,Soldner lecture.

1.Is the peak from $\theta$=0.0 to 0.4 due to total external reflection from the first upper surface?.

2.There is another peak at $\theta$=1.0. Is it because of Bragg's interference?(As given in slide 23 of Stewart's lectures.

3.Why are there alternative peaks between $\theta$=0.4 and 1.0?

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Here are the answers:

  1. Yes.

  2. Yes... But is it better called as Darwin's plateau.

  3. Those are fine structure arising from multiple wave interference (and are not seen experimentally) (see page 16 of Analysis and design of multilayer structures for neutron monochromators and supermirrors ,S. Masalovich )

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