9041
In this review , we discuss monolayer structures ranging from surfaces ( two - dimensional ) down to single molecules ( zero - dimensional ) , with a focus on applications of each type of structure , and on techniques that enable characterization of monolayer physical properties down to the single - molecule scale .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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