## 3 Results and Discussion
In the case of the air plasma modification of the support, a slight decrease in the water contact angle on the coating can be observed (sample #1 compared to #2 and sample #4 compared to #5), while argon plasma modification causes a slight increase of the contact angle (sample #1 compared to #3) or does not affect surface wettability (sample #4 compared to #6). Moreover, plasma activation will improve the coatings adhesion [57; 58]. However, it is necessary to carry specialized durability tests out in order to investigate this phenomenon. The linear (R) as well as the areal (S) roughness parameters of the obtained surfaces are presented in Figure 1:2 The arithmetic mean deviation of the roughness profile (R\({}_{\text{a}}\)) and the root mean square deviation of the roughness profile (R\({}_{\text{q}}\)) are commonly used to describe surface roughness [59; 60]. However, they are linear roughness parameters and do not take the entire sampling area into account, only the roughness profile along one of the arbitrary selected axes. As can be seen in Table 3, the linear parameters (R\({}_{\text{a}}\) and R\({}_{\text{q}}\)) differ significantly from the corresponding areal parameters (arithmetical mean height--S\({}_{\text{a}}\), and root mean square height--S\({}_{\text{q}}\)). It is postulated that the areal parameters provide more information about the complexity of surfaces and allow for better understanding of surface morphology than the profile (linear) parameters [61]. Thus, the areal parameters were calculated, and they will be analyzed for better surface description. S\({}_{\text{a}}\) and S\({}_{\text{q}}\) are significantly higher in the case of samples #7 and #8--they differ by several orders of magnitude. This explains the different methods of applying the coatings, and thus obtaining a layer with a greater thickness and heterogeneity, compared to the other samples. This is reflected in the surface height maps in Figure 8, where there are more peaks and high flat areas compared to samples #1-#6. This is also the reason for the larger contact angles and contact angles hysteresis values on surfaces #7 and #8 as it was mentioned above. It should be kept in mind that the S\({}_{\text{a}}\) and the S\({}_{\text{q}}\) parameters can be specious for the surfaces with different spatial and height symmetries. They can have the same S\({}_{\text{a}}\) or S\({}_{\text{q}}\) while the texture will be completely different. Thus, other height, spatial or hybrid parameters for the obtained surfaces were calculated. The skewness (S\({}_{\text{sk}}\)) for all surfaces, except #3, is a positive value. This indicates the predominance of peaks structures, while the negative value for sample #3 points out to predominance of the surface comprising valleys. The kurtosis (S\({}_{\text{ku}}\)) evaluates sharpness in the height distribution; its value above 3.0 for all the samples means that there are excessively high peaks and/or deep valleys on these surfaces. The root mean square gradient (S\({}_{\text{dq}}\)) represents the mean magnitude of the local slopes forming the surface--the greater the value of S\({}_{\text{dq}}\), the more steeply the surface is inclined. This is useful for differentiating surfaces with similar S\({}_{\text{a}}\) values. Samples #2 and #5 are such an example. They are both deposited on the support activated by air plasma and characterized by similar S\({}_{\text{a}}\) values (4.289 nm and 4.11 nm, respectively). However,