LayerMask.NameToLayer

public static int NameToLayer (string layerName);

Description

Given a layer name, returns the layer index as defined by either a Builtin or a User Layer in the Tags and Layers manager.

Returns -1 if not found.

using UnityEngine;

public class Example : MonoBehaviour
{
    void Start()
    {
        Debug.Log(LayerMask.NameToLayer("TransparentFX"));
    }
}