1. The designer may create an odd-numbered printed circuit board (PCB).

2. If the wiring doesn’t require an additional layer, why implement it?

3. Wouldn’t reducing the layers make the circuit board thinner?

4. With one less layer, wouldn’t the cost be lower?

5. However, in some cases, adding a layer can actually reduce costs.

6. Circuit boards have two distinct structures: core structure and foil structure.

7. In the core structure, all conductive layers are coated on the core material; in the foil-clad structure, only the inner conductive layer is applied to the core, while the outer layer consists of a foil-clad dielectric board.

8. All conductive layers are bonded together through a dielectric using a multilayer lamination process.