Abstract: A method and structures are provided for implementing enhanced thermal conductivity between a lid and heat sink for stacked modules. A chip lid and lateral heat distributor includes cooperating features for implementing enhanced thermal conductivity. The chip lid includes a groove along an inner side wall including a flat wall surface and a curved edge surface. The lateral heat distributor includes a mating edge portion received within the groove. The mating edge portion includes a bent arm for engaging the curved edge surface groove and a flat portion. The lateral heat distributor is assembled into place with the chip lid, the mating edge portion of the lateral heat distributor bends and snaps into the groove of the chip lid. The bent arm portion presses on the curved surface of the groove, and provides an upward force to push the flat portion against the flat wall surface of the groove.