Hello, there. I'm having a small problem with Miller's indices. 1) Imagine that the plane (2 1 1) is given in the fcc lattice. How can I determine Miller's indices of that plane in the sc and in the bcc? 2) And after that, how can I find the density of lattice's points? 1) So far I took the vectors of the reciprocal space: a*, b* and c* and then I tried to compute the vector G=n1a* + n2b* + n3c* But then what? 2) The only thing that I know is that the density of lattice's points is proportional of the quantity 1/G Any help?