How do I alternate the colors of my Chessboard?

Okay, so I've managed to make my script generate a set of tiles, 8x8, as in a chessboard, but the problem is that I don't know how to alternate the colors, i.e my sprites that I have set up, on my tiles. I've tried making an int that changes and where the tiles get generated I put some if-statements but that didn't work, the pieces just turned black. I don't know how to make the colors alternate and I couldn't find anything helpful on google either. So it'd be great if you could explain to me what I need to do, and please don't post something that says that I have to do something advanced.

Anyways, here's my script so far:

 using UnityEngine;
 using System.Collections;
 
 public class Board : MonoBehaviour 
 {
 
     public Sprite wT;
     public Sprite bT;
     public GameObject emptyTile;
 
     public int[] whiteTileNums;
 
     void Start ()
     {
 
         whiteTileNums = new int[4];
         whiteTileNums[0] = 2;
         whiteTileNums[1] = 4;
         whiteTileNums[2] = 6;
         whiteTileNums[3] = 8;
 
 
         for(float x = 0; x < 8; x++)
         {
 
             for(float y = 0; y < 8; y++)
             {
 
                 
                 Vector2 newTilePos = new Vector2(x - 3.6f, -y + 3);
                 
                 GameObject newTile = (GameObject)Instantiate(emptyTile, new Vector3(newTilePos.x, newTilePos.y, 0), Quaternion.identity);
             
                 newTile.GetComponent<SpriteRenderer>().sprite = wT;
 
             }
 
         }
 
     }
 
 }