X-ray radiation of poly-L-arginine hydrochloride and multilayered DNA-coatings Agnieszka Stypczyńska, Tony Nixon and Nigel Mason Eur. Phys. J. D, 68 11 (2014) 333 Published online: 03 November 2014 DOI: 10.1140/epjd/e2014-40845-8