A LayerConnection associates a SPP to an ActorRef, resulting in a connection of all SAPs of all contained ActorRefs within
([Online documentation](https://eclipse.dev/etrice/docs/concepts/layering))

```room
LayerConnection ref actorRef1 satisfied_by actorRef2.spp2
LayerConnection relay_sap spp1 satisfied_by actorRef2.spp2
```