>“You’re talking about something with over a hundred layers of substrate,” Can anyone point me in the direction of a commercially available or military product

>“You’re talking about something with over a hundred layers of substrate,” Can anyone point me in the direction of a commercially available or military product with a PCB that has more than 100 layers? Presuming that is ~50 copper layers. How thick is that board? Or how about a commercially available PCB with more than 12 copper layers.