*2.2. Roughness and Microscopy*

The roughness measurements were carried out with a focus-variation microscopy using an Alicona Infinite Focus apparatus. The values presented are the average of 200 lines of 400 μm long. The microstructure of the samples was analyzed on the cross-section after OPS polishing with a Supra40 Scanning Electron Microscope (Carl Zeiss, Oberkochen, Germany).
