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I know that it is most often stated as [tex]2dSin \theta=n\lambda[/tex]

But I have come across a case (Kittel chp9 pg 255, where it is written as ([tex]\vec{k}[/tex]+[tex]\vec{G}[/tex])[tex]^{2} = k[/tex]

I cannot really see how the vectorial case is the same as the simpler former one.

Could someone elucidate?

Thanks