How can i make an entity with 2D nextbot like rotation towards the player?

Hello, just as exactly as you read in the title of this post.

How can i make an entity to face the player (not like a regular mob with turning its neck or something similar) but like a 2D Nextbot. 

To simplify it, let me show you what do i mean with the entity facing the player

what i mean is a rotation like the entity R2 does, from The Broken Script mod.