There is an armor enchantment called Rebound:
20% chance to Stun attacker for 2.0 sec when the wearer is Hit (includes Crit) with a melee weapon

 

But what about a stunned enemy's recovery? Does recovery temporarily cease to progress under the stunned effect? If not, I think the Rebound armor enchantment would be pointless because enemies' recoveries usually take more than 2 seconds. That means they would have to wait more than 2 seconds until they can attack you again anyway, so getting stunned for just 2 seconds does not really matter to them.

I believe so, yes. You can look at the recovery bar over the heads of each character.