How to put an Object in BackroundLayer whilst running the game,

Hey Guys, i wanna play an animation and destroy the animation after its end. For that i set a timer. My Problem is, that the GameObject is still existing the set time, although i want to remove the GameObject immediately after it was hit, i just want the explosion to play. Now my Idea was to put the Object in the BackroundLayer, so that you cant see and hit it anymore. I dont have any clue how to put an Object in the Backround while the Game is running. Would be nice if you could give me some Code for that... :) Thanks for ur answers.

void Die() { StartCoroutine(DestroyTimer());

 }

 IEnumerator  DestroyTimer()
 {
     var cloneAnimation = Instantiate (deathEffect, transform.position, Quaternion.identity);
           //At this point it want to change the Layer of the GameObject, so that the explosion can play 
          //but i cant see and shoot the GameObject anymore
     yield return new WaitForSeconds(0.1f);
     Destroy(this.gameObject);
     Destroy (cloneAnimation);
 }