wigner_small_d

de_ebsd.index.spherical.wigner_small_d(ell, beta)

Real small Wigner-d matrix d^l_{m'm}(beta) for a single degree ell.

beta is a real tensor of any shape. Returns (*beta.shape, 2l+1, 2l+1) real, with row index m' and column index m (both -l .. l), computed as matrix_exp(beta * K_l) (the exp(-i beta J_y) convention).