Unity 2D instantiate prefabs order - unity3d

Question

I'm instantiating enemy prefabs in waves, but when I do, the sprites are not consistent on the Z axis. Sometimes the second enemy is on top of the first one, and sometimes behind.
I want the new instance always behind the other.

Answer 1

Keep the instance position and instantiate the gameobject behind.
GameObject myGo1 = GameObject.Instantiate(prefabRef, Vector3.Zero,
Quaternion.Identity);
float distance = 1.0f;
Vector3 myGo2Pos = myGo1.position - myGo1.transform.forward * distance;
GameObject myGo2 = GameObject.Instantiate(prefabRef, myGo2Pos, Quaternion.Identity);
For the 1st GO instatiation, where Vector3.Zero you can choose the position of your choice. For whatever pos and rot you instantiate myGo1 with, the code Vector3 myGo2Pos = myGo1.position - myGo1.forward * distance; should instantiate the 2nd one distance meters behind.
Not debugged code, just for your inspiration.
Probably you might need the 2nd GO to look to the first one, in that case you can do:
GameObject myGo2 = GameObject.Instantiate(prefabRef, myGo2Pos, myGo1.transform.rotation);

Answer 2

Alright i figured it out. had to add a sprite renderer component like so:
SpriteRenderer spriteRenderer;
and where i instantiate:
void FollowPath()
{
if (!isAttacking)
{
if (waypointIndex < waypoints.Count)
{
**spriteRenderer = GetComponent<SpriteRenderer>();
spriteRenderer.sortingOrder++;**
Vector3 targetPosition = waypoints[waypointIndex].position;
float delta = waveconfig.GetMoveSpeed() * Time.deltaTime;
transform.position = Vector2.MoveTowards(transform.position, targetPosition, delta);
if (transform.position == targetPosition)
{
waypointIndex++;
}
}
}
}