We would like to add two RCC layers each to the top and bottom of an 4-layer FR-4 board. Does anyone have experience or suggestion to handle multi RCC layers? We would like to have microvia connecting the top RCC layer to the outer FR-4 layer, as well as having some microvias connecting both the RCC layers to the outer FR-4 layer. Ideally, we would like to have microvias connecting three layers without offset drilling. Is it possible to do the following: Add one RCC layer, finish the microvia process, add another RCC layer on top of the RCC layer, drill microvia at the same drill location as the previous RCC layer. Any information would be highly appreciated. Patrick Lam Glenayre R&D Phone:(604)293.4392 ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################