68-position, 0.050-inch pitch board-to-board receptacle
Mated stack heights are 11.43 mm and 12.57 mm — two options from the same receptacle, which gives board layout flexibility without changing the connector.
At 68 positions on two rows, the footprint is roughly 1.73 inches long (68 × 0.050" / 2 rows). The 0.100" row spacing leaves room for one trace between rows on a standard two-layer board, but with 68 signals, a four-layer board is more practical for fan-out. The 0.350" (8.89 mm) insulation height means the receptacle body sits well above the board — account for that in your z-height budget when stacking boards.