The UxV/35™ is thought of as a stack as that is how boards are connected. They can be planar as well.
This platform allows four stacks to be interconnected. It is designed to be the bottom board in 4 different UxV/35™ stacks.
Additionally, there are footprints for 40 position, 2mm ribbon cables of each side for further expansion.
These are great for usage in UGV and USV platforms or to create test benches for validation of specific functionality.
KA1040-01 Data Sheet