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  A PCB layer alludes to a copper layer, and the PCB layer number means the copper layer number. A 6-layer printed circuit board, by its name, implies the circuit board has 6 layers of copper circuit layers. 6-layer PCBs have a minimized part format and decrease fabricating costs. There isn't a lot of contrast in cost somewhere in the range of 2 and 4-layer PCBs, yet 4-layer PCBs is greatly improved. Suggested for breakouts, little and basic sheets.   The present completely stacked very good quality motherboards  6 layer pcb stackup are normally either 6 or 8 layers, as they generally highlight a lot more parts and require more      ability to run them, consequently more layers to interface and power them. The prepreg and center are two unique pieces of the PCB. First of all, the center is an FR4 material with the copper following. Though, the prepreg is fiberglass impregnated with tar. It is the prepreg that keeps the center intact on the PCB.   The quantity of layers you