get yaw of block face

Code:

    @EventHandler
    public void onPlayerInteract(PlayerInteractEvent event) {
        Player player = event.getPlayer();
        Block b = event.getClickedBlock();
        Action action = event.getAction();
        World world = player.getWorld();

        if (action == Action.RIGHT_CLICK_BLOCK && event.getHand() == EquipmentSlot.HAND && b.getType() == Material.SKULL) {

            Skull skull = (Skull) event.getClickedBlock().getState();
            skull.getRotation();
            System.out.println( skull.getRotation());

            Location loc = new Location(Bukkit.getWorld("world"), b.getX(), b.getY(), b.getZ(), b.getLocation().getYaw(), b.getLocation().getPitch()).add(0.5, 0, 0.5);
            Slime slime = (Slime) player.getWorld().spawnEntity(b.getLocation().add(0.5, 100, 0.5), EntityType.SLIME);
            slime.setSize(1);
            slime.setSilent(true);
            slime.setAI(false);
            slime.teleport(loc);
        }
    }

i want to teleport slime to skull yaw, how do i do that? help is appreciated, thank you!

 

I'm not sure what skull.getRotation() returns, but I suggest that you use that instead of the yaw of the block (b.getLocation().getYaw())