Crystal structure of ∼RCu3S3 and ∼RCuTe2 (R=Gd-Lu) compounds

► The ∼RCu3S3 and ∼RCuTe2 (R=Gd-Lu) crystallize with layered structure. ► Superstructure √3a×√3a×nc (n=1, 2, 3) to CaAl2Si2 structure type is found. ► TbCuTe2 and DyCuTe2 crystallize as superstructure 2a×2a×2c. ► Disorder of R and Cu atoms in studied chalcogenides is found.