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How do they? I don't have access to the Codex. (I don't need stat lines, just the rule for how they work)

This belongs in general discussion, or even you make da call.

To answer your question, however: For every roll of 6, an ADDITIONAL 2 automatic hits.

After the initial shooting, roll against every unit friend or foe within 6" of the targeted unit. On a 6, that unit takes D6 S5 AP- hits.

chainsrawr is right about the first part, but the second part, ie "After the initial shooting, roll against every unit (both friendly and enemy) within 6" of the target. On a 6, that unit takes D6 S5 AP- hits" only applies to Telsa weapons with the Arc characteristic (I don't have my codex with me, but I believe that is only the Telsa Destructor on the Annihilation Barge).

Also, the you can only use the Arc special rule if at least one model was hit in the target unit. And, in case it wasn't clear, Tesla does count for Snap Shots/Overwatch

This forum is not a replacement for purchasing game rules. If you aren't interested in purchasing the rules, then looking at a store copy or borrowing it from your opponent will solve the problem.