We made a lot of Rogers material+FR4 board,we call them mix stackup board. All are 6 layer PCB with special stackup. The stackup is as below. The stackup is making like an 8 layer PCB.
L1/L2 Core: RO 4350B 6.6mil
The PCB is 1.6mm, 1oz, blue solder mask,white silkscreen and immerion gold.Another special is the end lanch connector treatment. Trace at the connector is very small,we can not v-groove this board,otherwise,it will damage the trace and make short .
Pls see how to load the end lanch connector correclty.it is very strict,the board will not work if any damage.
how to load the end lanch connector.see below.