In Case you’ve study the portion over about steel foil stamping, the method might be straightforward to photo. Inside the stack of materials: your cover on the bottom. Higher than it the (optional) foil and afterwards the metallic stamp (die) by using a reversed Variation of the style or design https://illustrationartistsforhire.blogspot.com/2024/09/a-book-cover-design-can-make-difference.html