Resources.Load folders path?

Hi,
Im trying to load a resource Textures with script, this works ok except that i cant load the texture from a folder called “letters” that i put inside Recourses. How can i set the folder path ?
Also, will this work with a String variable ?

renderer.material.mainTexture = Resources.Load(“StringVar\AaLetter”); ???

TY

if StringVarAaLetters is in the path “Resources/letters/StringVarAaLetter”:

  string texturePath = "letters/StringVarAaLetter";
  renderer.material.mainTexture = (Texture)Resources.Load(texturePath, typeof(Texture));

You can do this (with the newer version of unity) :

string texturePath = "letters/StringVarAaLetter";
renderer.material.mainTexture = Resources.Load<Texture>(texturePath);