A2B_tI6_139_d_a & a,c/a --params=4.1,1.22682926829 & I4/mmm D_{4h}^{17} #139 (ad) & tI6 & L'2 & ThH2 & & R. E. Rundle, C. G. Shull and E. O. Wollan, Acta Cryst. 5, 22-26 (1952) 1.0000000000000000 -2.05000000000000 2.05000000000000 2.51500000000000 2.05000000000000 -2.05000000000000 2.51500000000000 2.05000000000000 2.05000000000000 -2.51500000000000 H Th 2 1 Direct 0.25000000000000 0.75000000000000 0.50000000000000 H (4d) 0.75000000000000 0.25000000000000 0.50000000000000 H (4d) 0.00000000000000 0.00000000000000 0.00000000000000 Th (2a)