Molex offers the following Product Families that relate to Stacking Board-to-Board.

Molex SlimStack connectorsSlimStack
SlimStack is a proven, reliable way to connect PCBs together using slim, low-profile SMT connectors, and offers a variety of high density board-to-board solutions in a wide range of centerlines, stack heights and circuit counts. (View More)

Molex MDC stacking connectorMDC Board-to-Board Connector
Molex offers the MDC connectors for mobile personal computer audio and modem codec solutions. (View More)