Text this: 2DEG enhancement via epilayer stress engineering in AlN/GaN/AlN heterostructure

 _    _    _    _     ______   __   __    _  _   
| || | || | || | ||  /_   _//  \ \\/ //  | \| || 
| || | || | || | ||    | ||     \ ` //   |  ' || 
| \\_/ || | \\_/ ||   _| ||      | ||    | .  || 
 \____//   \____//   /__//       |_||    |_|\_|| 
  `---`     `---`    `--`        `-`'    `-` -`