How I make my enemy face the player or flip towards player (top-down game)?

Sorry for my bad English.

2D btw

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class Enemy : MonoBehaviour {

 // Public Variables

 public float speed;
 public GameObject effect;

 // Private Variables

 private Transform playerPos;
 private Player player;
 private Shake shake;

 // Functions

 private void Start()
 {
     shake = GameObject.FindGameObjectWithTag("ScreenShake").GetComponent<Shake>();
     player = GameObject.FindGameObjectWithTag("Player").GetComponent<Player>();
     playerPos = GameObject.FindGameObjectWithTag("Player").transform;
 }

 private void Update()
 {
     transform.position = Vector2.MoveTowards(transform.position, playerPos.position, speed * Time.deltaTime);
 }

 private void OnTriggerEnter2D(Collider2D other)
 {
     if (other.CompareTag("Player"))
     {
         shake.CamShake();
         Instantiate(effect, transform.position, Quaternion.identity);
         player.health--;
         Destroy(gameObject);
     }

     if (other.CompareTag("Projectile"))
     {
         shake.CamShake();
         Instantiate(effect, transform.position, Quaternion.identity);
         Destroy(gameObject);
     }
 }

}