Problem with LayerMasks

Hi,

I am having some problems working with Layermasks.
I want to create a Layermask which only interacts with the Layer of the gameobject and another Layer which is always 4 Layers below the gameobject Layer.
However I can´t use specific Layer numbers since my gameobject has to switch Layers all the time.
Would love if someone can help me out.

Code (CSharp):

1. bool CollisionCheck(Vector2 v2StartOffSet, Vector2 v2EndOffSet)
2. {
3.     //This is the part I can´t figure out
4.     int iWorldLayer = gameObject.layer - 4;    //Currently Layer: 11
5.     int iPlayerLayer = gameObject.layer;    //Currently Layer: 15
6.  
7.     int iTargetLayer = iWorldLayer | iPlayerLayer;
8.     LayerMask lmTargetLayer = 1 << iTargetLayer;
9.  
10.  
11.  
12.  
13.  
14.  
15.     Vector2 v2LineStart = (Vector2)gameObject.transform.position + v2BoxColliderCenter + v2StartOffSet;
16.     Vector2 v2LineEnd = (Vector2)gameObject.transform.position + v2BoxColliderCenter + v2EndOffSet;
17.  
18.     if(bRenderRaysInEditor == true)
19.     {
20.         Debug.DrawLine(v2LineStart, v2LineEnd, Color.blue);
21.     }
22.  
23.     RaycastHit2D Hit;
24.     Hit = Physics2D.Linecast(v2LineStart, v2LineEnd, lmTargetLayer);
25.     return Hit;
26. }

 

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Code (CSharp):

1. LayerMask A = 1<< worldLayer
2. LayerMask B = 1<<playerLayer
3. layermask Both = A | B