How to check on which layer the mouse is pressed and combine it with the movement of a click

Unity Engine
1

I have a click to move option I learned from this guide:

The tutorial is excellent, but I do not know how to combine a test of which layer the past is clicked on, because I do not want for example, that when the mouse is clicked on the UI the character will not move foreign?

2

please help me!

3 
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems; // Add this line

public class ClickToMove : MonoBehaviour
{
    ...

    void Update()
    {
        if (Input.GetMouseButton(0))
        {
            // Check if mouse button was clicked over a UI element
            if (EventSystem.current.IsPointerOverGameObject())
            {
                Debug.Log("Clicked on the UI");
                return;
            }

            SetTargetPosition();
        }

        if (isMoving)
        {
            Move();
        }
    }

    ...
}
4

Thanks a lot for the help, but I want to check by layer and not by GameObject there is a way?