In the event that most of the echo is from first surface reflections ( or so), the OC radar albedo is a first-order approximation of the Fresnel reflection coefficient (aka reflectivity) and can be used to estimate the bulk density of a planetary surface to a depth of a meter or so (a few wavelengths of the radar wavelength which is typically at the decimeter scale) using the following empirical relationships:
ɪnðɪ ᵻvˈɛnt ðæt mˈoʊst əv ðɪ ˈɛkoʊ ɪz fɹʌm fˈɜːst sˈɜːfɪs ɹᵻflˈɛkʃənz ɔːɹ sˈoʊ, ðɪ ˌoʊsˈiː ɹˈeɪdɑːɹ ælbˈiːdoʊ ɪz ɐ fˈɜːstˈɔːɹdɚɹ ɐpɹˌɑːksɪmˈeɪʃən ʌvðə fɹˈɛsnəl ɹᵻflˈɛkʃən kˌoʊɪfˈɪʃənt ˈækɐ ɹᵻflɪktˈɪvᵻɾi ænd kæn biː jˈuːzd tʊ ˈɛstᵻmˌeɪt ðə bˈʌlk dˈɛnsᵻɾi əvə plˈænɪtˌɛɹi sˈɜːfɪs tʊ ɐ dˈɛpθ əvə mˈiːɾɚ ɔːɹ sˌoʊ ɐ fjˈuː wˈeɪvlɛŋθs ʌvðə ɹˈeɪdɑːɹ wˈeɪvlɛŋθ wˌɪtʃ ɪz tˈɪpɪkli æt ðə dɛsˈɪmᵻɾɚ skˈeɪl jˈuːzɪŋ ðə fˈɑːloʊɪŋ ɛmpˈɪɹɪkəl ɹᵻlˈeɪʃənʃˌɪps: