thunderbolt 2

can you run a Thun 3 interface on a Mac with Thun 2..albeit at a slower speed...??
You need an adapter cable. The Apple cable is bi-directional, i.e., it works to connect T3 devices to T2 Macs, or T2 devices to T3 Macs. Costs $49 for that piece of magic, though I'm sure there are some 3rd party adapters out there.

If what you actually have is a USB 3.0 interface with a USB-C jack, you could just connect that to a USB 2.0 port with the appropriate USB-C -> USB-A cable.
 
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