Illustrative copper-layer functions and RF dielectric heightName the reference plane and every dielectricIllustrative six-layer discussion sketch · no material or thickness is approved hereL1 · RF / antennaL2 · RF reference groundL3 · signal / power planningL4 · reference planningL5 · signal / power planningL6 · lower copperRF dielectric: grade / cured height / tolerancehLayer functions, symmetry, return paths and bonding sequence require project-specific review.