Material: "Panel dragons brass oxide" of two types (weak and strong oxide) with accompanying maps. Archived Maps for Reflect Glossiness and Metallic Roughness engines.
Textures with a resolution of 4096x4096
Scene with two spheres 3dsmax_2014 on which the adjusted PBR material is weak and strong oxide, take it with an eyedropper and put it on your object (plane) - you can also adjust the material for yourself. Adjust Displacement to your liking.