Problem 2 (6 points) We have a 3-dimensional lattice structure with a basis of 2 atoms at the following coordinates. a) Describe and draw what is this structure?? 1 = (0,0,0) 12 = (1,0,1) 2TT a G = - (n1, n2, n3) Where, n,, n2,n3 are integers b) Calculate S for different combinations of n,, n2,n3 , being odd or even to define zero and non-zero x-ray amplitudes. Here f is the form factor and is a constant and identical for both atoms. SG = e -iG . rj