hello siesta users , I have doubt about the direction of polarization given by optical vector in input file. Suppose we have lattice angles other than 90,90, 90 such that lattice vectors a, b, c do not match with coordinates x, y and z and if we set optical vector " 1 0 0" then what is the direction of polarization ?? Is the direction of polarization along x -axis or along lattice vector a??
Thank you Veerpal Kaur.
