The Photocatalytic Activity and Compact Layer Characteristics of TiO₂ Films Prepared Using Radio Frequency Magnetron Sputtering

Table 4

The Grey relational grade and its ranking for the TiO₂ compact layer coatings.

Exp.	Grey relational grade	Rank
1	0.3595	8
2	0.3526	9
3	0.4252	6
4	0.4551	4
5	0.3914	7
6	0.4356	5
7	0.5698	3
8	0.7007	2
9	0.8329	1