\[ \lambda = 2\,d_{hkl}\sin\theta \qquad (n=1),\quad d_{hkl}=\dfrac{a}{\sqrt{h^2+k^2+l^2}} \]
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\[ \mathbf{G}_{hkl} = \mathbf{k} - \mathbf{k}_0,\qquad |\mathbf{k}|=|\mathbf{k}_0|=\tfrac{1}{\lambda} \]

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