Davisson-Germer experiment and Bragg's law

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In Davisson-Germer experiment the necessity of constructive interference is dsin(theta)=n(wavelenght) but in Braggs law its 2dsin(theta)=n(wavelenght), why are these two different? I saw that Braggs law is used between layers of crystals but I've also seen Davisson-Germer experiment's equation being used in distances between crystals, including the distance between the layers.
 

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  • #2
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Maybe the interatomic distance d is considered in a different way, from which book(s) did you get the diffraction laws ?
 

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