“…The tables below give the values of S, yo, n 1 and k 1 for Te and Au . S and yo are determined from the experimental curves given in figures 1 and 2, n 1 is calculated from equation (5) while k 1 is calculated by solving equation (4) using Cardan's method [8]. The solution of this equation gives three roots, one of which is real while the others are imaginary ; since k 1 is real, only the real root must be taken .…”