“…Several fabrication methods have been employed to grow the epitaxial (single crystal-like) SnO 2 thin films, which include sputtering [11][12][13][14][15][16], chemical vapor deposition (CVD) [17][18][19][20][21][22][23][24], physical vapor deposition (PVD) [25], pulsed laser deposition (PLD) [26][27][28][29][30], an excimer laser-assisted metal organic deposition (ELAMOD) [31], molecular beam epitaxy [32,33], and atomic layer deposition (ALD) [9,[34][35][36][37][38]. The commonly used substrates are sapphire (Al 2 O 3 ) [(0 0 0 1) (c-cut) and (1 1 0 2) (r-cut)] and TiO 2 [(0 0 1), (1 1 0), (1 0 0), and (1 1 1)], and in-and out-of-plane epitaxial relationships between SnO 2 films and substrates have been reported.…”