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  ______    _____               _____    ______   
 /_   _//  |  ___||   ____     |  ___|| |      \\ 
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  _| ||    | ||__    | [] ||   | ||__   |  --  \\ 
 /__//     |_____||  |  __//   |_____|| |______// 
 `--`      `-----`   |_|`-`    `-----`  `------`  
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Text this: Effect of fluorination on the molecular packing of perfluoropentacene and pentacene ultrathin films on Ag (111)