layer at index 0 is the Base layer in the animator controller.
in layer at index 1 i have a layer name Pointing.

at the top:

private float LayerWeightTarget = 0;
private float CurrentLayerWeight = 0;
private int layerIndex = 0;

in the Update

private void Update()
{
    // Determine if the character should be pointing
    bool shouldPoint = lastPrimaryTarget != null && fingerPointing;
    LayerWeightTarget = shouldPoint ? 1.0f : 0.0f;

    // Update the current layer weight towards the target weight
    if (Mathf.Abs(CurrentLayerWeight - LayerWeightTarget) > 0.01f) // Adding a threshold to prevent continuous updates
    {
        CurrentLayerWeight += (LayerWeightTarget - CurrentLayerWeight) * 0.125f; // Smoothing the transition
        animator.SetLayerWeight(layerIndex, CurrentLayerWeight);
    }
}

but it’s not making smooth transition between the layers.

once the player is not pointing it keep “jumping” to the other layer and back when the player is pointing again there is a “jumping” to the first layer. it’s not smooth transition.