In a four-layer PCB, how many signal layers are usually present?

[jenniferolivia]

Hello, everyone! I have a question regarding PCB design. In a four-layer PCB, how many signal layers are usually present? I’d appreciate it if someone could provide the answer or share their knowledge on this topic. Thank you!

[eelik]

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[davidsrsb]

As the question is at least pcb related, I would say 3 or 2. I personally use one layer ground plane and three signal layers. Other use power and ground planes plus two signal