THIN FILM MATERIAL

Enable the substrate material options in the project settings menu.
WINDOWNS> EDIT> PROJECT SETTINGS> ENGINE> RENDERING> SUBSTRATE.
Restart the project after doing this!!

When creating a new material, link the substrate slab BSDF Single node to the material node.

Pay attention to the values so that the Thin Film effect is set correctly.

turn on the substrate thin film node with options F0 and F90 in the substrate slab BSDF Single node

then create a value tree to edit the x and y size of the textures. and add a black and white texture. for example...

Basic texture.

higher contrast texture

Then, to have greater organization, use the reference node, it prevents your project from having millions of cables. For more detailed information, I recommend this video
https://www.youtube.com/watch?v=ke6kcoRqEHw

by content creator and artist William

As you can see, I used a combination of these nodes for rugness and normal map, and combined them at the end of the material with other nodes.

and in the end it was like this.