code: def angledependentabsorption(twotheta, transmission):
      
      cor = np.ones(twotheta.shape)
      if transmission == 1:
          return cor
      mud = -np.log(transmission)
  
      cor[twotheta > 0] = transmission * mud * (1 - 1 / np.cos(twotheta[twotheta > 0])) / (np.exp(-mud / np.cos(twotheta[twotheta > 0])) - np.exp(-mud))
      return cor
docs: Correction for angle-dependent absorption of the sample
  
      Inputs:
          twotheta: matrix of two-theta values
          transmission: the transmission of the sample (I_after/I_before, or
              exp(-mu*d))
  
      The output matrix is of the same shape as twotheta. The scattering intensity
          matrix should be multiplied by it. Note, that this does not corrects for
          sample transmission by itself, as the 2*theta -> 0 limit of this matrix
          is unity. Twotheta==0 and transmission==1 cases are handled correctly
          (the limit is 1 in both cases).