“…It can be carried out without requiring expensive precursors and intricate syntheses. Indeed, various compositions were reported, either by incorporating interlayered species such as those offering a pillaring Fe(CN) 3− 6 [5], oxoanions [6][7][8][9], or Keggin anions [10][11][12] or by direct substitution inside the layers such as Mg 3 Al by Cu or Fe [13], Ni 2 : Fe-Al [14], Zn 2 : Al-Fe [15], Co 2 : Fe-Al [16], Cu-Co 2 : Al [17]. The incorporation of tetravalent cations such as Sn 4+ [18][19][20] and Zr 4+ [21,22] has also been reported.…”