Get player in another player's direction

I'd like to check if a player is directly in another player's direction. I'm also checking if the players are within a certain distance from each other, but the code I currently have works. Below is an example of what I'm looking for:

Code:

if(playerA.getLocation().distance(playerB.getLocation()) <= 2.0d && 'is in player's direction') {
  //code
}

I know there's a .hasLineOfSight method, but the player need to be directly in front of the player. Any help?