“…[ 60 ] In comparison, the exfoliation of TMOs, which are mostly of nonlayered structures, is basically hampered. The few examples of TMOs possessing layered structures include RuO 2 , [ 51 ] Na 2 Ti 3 O 7 , [ 61 ] V 2 O 5 , [56b,62] Bi 2 Sr 2 CaCu 2 O x , [ 63 ] WO 3 , [ 64 ] LiCoO 2 , [ 65 ] LiCo 0.95 Mg 0.05 O 2 , [ 65 ] MoO 3 , [ 66 ] K 0.45 MnO 2 , [ 67 ] KCa 2 Nb 3 O 10 , [ 68 ] K 2 Ln 2 Ti 3 O 10 , [ 69 ] KLnNb 2 O 7 , [ 69 ] RbLnTa 2 O 7 , [ 69 ] HNbMoO 6 , [ 70 ] MnO 2 [ 53,71 ] , etc. Compared with TMOs, more TMCs are of layered structures, e.g., MoS 2 , [ 72 ] ZnIn 2 S 4 , [ 73 ] TaS 2 , [ 74 ] TiS 2 , [ 75 ] WS 2 , [ 76 ] In 2 S 3 , [ 77 ] SnS, [ 78 ] SnS 2 , [ 79 ] SnSe, [ 80 ] SnSe 2 , [ 81 ] K 2 x Mn x Sn 3− x S 6 , [ 82 ] H 2 x Mn x Sn 3− x S 6 , [ 83 ] K 2 x Sn 4− x S 8− x , [ 84 ] etc.…”