Table 2. Structural features of pure and Nb:W co-doped SnO₂ films along with their thickness and surface roughness values.

Sample	Crystallite size D (nm)	Interplanar distance d (Å)	Lattice constants (Å)	Thickness (nm)	Surface roughness rw (nm)
TO	37.85	3.347	a = b = 4.734, c = 3.205	884.4	270
WTO	35.60	3.358	a = b = 4.748, c = 3.192	516.8	217
NWTO1	35.56	3.347	a = b = 4.734, c = 3.196	516.7	207
NWTO2	36.36	3.350	a = b = 4.737, c = 3.183	497.6	178