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If I have a InAs Wurtzite structure, and now the a and c parameter from tables. How can i calculate the distance between (1 0 3/2)_sur layers? (in surface coordinates)

I need it to find the angle of reflection, for a (1 0 3/2) WZ InAs peak.

Is it just so simple?

(1 0 3/2)_sur = (7/6 7/6 -5/6)_cubic (in cubic coordinates)

And then the distance is just

d=2*pi/G_hkl= a_cub / (sqrt(123/36))

And then i can just use braggs law

2dsin(angle)=wavelength