Such as, if a circuit involves more isolation among the signal layers or requirements more mechanical toughness, it'll make use of a thicker prepreg and core. This boost in the thickness of the fabric will incorporate nearly the overall thickness with the PCB. This adaptability can be a worthwhile reference https://andresgklmn.theblogfairy.com/30453711/not-known-details-about-14-layer-module-pcb-circuit-board