Table 3. Coordinate number (CN), number of Y sites in the CN, CN(Y), number of constituent atoms in the CN, CN(Y), N(Cd), N(Mg) and atomic occupations in the atomic structures of the Y-Cd-Mg 2/1 cAP.

Sites indicated by * and † are common to vertices and edge centres of the RTH shell, respectively.

Shell	Site	CN	CN(Y)	N(Y)	N(Cd)	N(Mg)	Y/Cd/Mg
Dodecahedron	M8*	13	3	3.00	8.20	1.80	0/0.87/0.13
	M9	11	3	2.50	4.71	3.80	0/0.95/0.05
	M13	10	3	2.50	4.77	2.73	0/0.88/0.13
	M14	11	3	2.50	5.25	3.25	0/0.82/0.18
	M15*	13	3	2.50	7.84	2.56	0/0.78/0.22
	M16*	14	3	3.00	8.51	2.49	0/0.82/0.19
	M19	11	3	2.50	5.61	2.89	0/0.72/0.29
	M21	12	3	3.00	6.61	2.39	0/0.60/0.40
Icosahedron	Y1	17	0	0	13.36	3.64	1/0/0
	Y2	16	0	0	12.51	3.50	1/0/0
	Y3	16	0	0	11.38	4.62	0.50/0/0.50
	Y4	16	0	0	12.07	3.93	1/0/0
Icosidodecahedron	M6†	13	3	3.00	7.37	2.63	0/0.87/0.14
	M7†	13	3	3.00	7.06	2.94	0/0.89/0.11
	M10†	13	3	3.00	7.19	2.81	0/0.84/0.16
	M11†	12	3	3.00	5.98	3.02	0/0.85/0.15
	M12†	13	3	2.50	7.38	3.13	0/0.82/0.18
	M17†	13	3	2.50	7.32	3.19	0/0.75/0.25
	M18†	13	3	2.50	7.35	3.15	0/0.72/0.28
	M20	15	3	2.24	8.15	4.62	0/0.49/0.51
	M22	15	2	1.50	9.03	4.47	0/0.31/0.69
	M25	15	2	1.50	9.29	4.21	0/0.15/0.85
Edge centre of RTH	M1	12	3	2.00	4.77	5.23	0/1/0
	M2	12	3	3.00	5.09	3.91	0/1/0
	M3	12	3	3.00	5.14	3.86	0/0.98/0.03
	M4	12	3	1.74	4.64	5.63	0/0.97/0.03
	M5	12	4	3.47	4.95	3.58	0/0.94/0.06
Vertices of RTH	M23	13	2	1.74	7.90	3.36	0/0.20/0.80
	M24	12	2	2.00	7.66	2.34	0/0.16/0.84
	M26	12	3	1.50	8.39	2.11	0/0.06/0.94
Two sites inside DFP	Y5	16	1	0.74	10.64	4.62	0.74/0/0.26