They are layered, the back gray cardboard, and the lighter front cardboard. The layers are about the same thickness, so even worn ones often won't show layers clearly. Some cards that have gotten a bit dusty retain enough "stuff" on the edge to make the layers hard to see.
I checked about 10 of mine, and all were layered. Leaf had at least 3 press runs, likely more, so one that isn't layered or layered differently wouldn't be some thing I'd automatically reject.
The only thing I have that would take a good picture would be a USB microscope, which I'll get out later.
None of mine are glossy overall, and I don't think I've ever seen one that is.
But they used a lot of different inks, and there are differences in the front layer of cardboard, so the glossiness of the individual inks is variable. None should be modern glossy, but similar to other cards, if seen at an angle the inks may look a bit shiny. On Leaf, they're generally not shiny.
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