ephrin-B2 and EphB2

The complex composed of truncated murine ephrin-B2 and EphB2 has been reported to be tetrameric. So I wish to raise the following two questions:

1. Is full-length human ephrin-B2EphB2 complex also tetrameric like this figure?

2. If so, can we measure the binding force between ephrin-B2 dimer and EphB2 dimer using AFM?

Addendum primum:

I have found this paper related to the above questions.